Light



April 7, 1925. 1,532,332

C. H. MUCKENHIRN LIGHT Filed Aug, 4, 1921 Patented 7, 1%235.

rarest orrlcu.

crrnnnns n. resonant-Iran, or: Darn rr, MICHIGAN.

LIGHT.

Application filed August 4, 192-1. Serial No. 489,706.

To all whom it may concern:

Be itknown that I, Crrnnnns H. Mncnnninns, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Lights, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an ii'nnroved front for lights particularly an me e lights, tail lights, head lights, trouble lamps and the like.

The object of the invention is to provide an improved front or lens construction of an inexpensive nature that will be eflioient in use and more durable than the usual glass lens. I

The invention contemplates an improved front or lens composed of thin flexible film like material such as pyroxylin. celluloid, or like material, and of a cross sectional formation providing a succession of concentrically arranged projecting portions or bulges of progressively varying diameter and with said projecting portions or bulges rounded and merging by easy or gradual curvatures into one another. the bulges or projecting portions in addition to functioning as light diffusing or controlling portions. serving to reinforce and give sufficient stabilityto the structure, the resulting construction being less expensive to produce and more durable than a lens of glass, not subject to breakage by dropping in handling or in shipment, and better able to withstand jars when in place in a lamp.

In the drawingsz' Figure 1 is an elevation of a front or lens constructed in accordance with the present invention.

Figure 2 is a central section.

The invention with other objects and advantages thereof, and the particular construction comprising the same, will be understood from the following detail description, when considered in connection with the accompanying drawings forming part hereof and illustrating one embodiment of the invention.

While a specific embodiment of the invention is illustrated in the drawings, it

will of course be understood that changes and variations in the particular construction shown, and the carrying out of the invention in other forms, as will appeal to those skilled in the art, and falling within the scope of the appended claim, may be practiced without departing from the spirit of the invention.

In the drawing, the front or lens shown particularly adapted for automobile rear :21 tail lights. A designates the front or ,...ns formed from a thin flexible sheet of pyroxylin, celluloid or the like, and of a cross sectional shape providing a flat outer marginal part a, and, inwardly thereof, a succession-of concentrically arranged projectin portions or bulges a of progressively varying diameters, said bulges or projecting portions a in the particular construction shown, being rounded and merging by easy curvatures into one another.

In the construction shown the fiat outer marginal part a, which is adapted to be engaged by the usual lens holding means, (not shown), is shown provided with size indicating marks o The succession of bulges or projecting portions of progressively varying diameters act as light diffusing portions and additionallyperform the important function of reinforcing-and lending the required stiffness or stability to the structure. The particular rounded form of the bulges or projections merging into one another in easy or gradual curvatures, as in the construction shown in the drawings, is especially advantageous in furnishing the required stiffness and at the same time permitting of lateral springing or flexing without breakage in the case of extreme lateral pressure thereupon, and this special construction also possesses the important advantage that it has no sharp corners or crevices for the lodgement of mud or dirt thereon and can be easily kept clean.

It will be noted that the particular construction of front or lens hereinbefore de-' scribed, is of an inexpensive nature and is not liable to breakage like the expensive glass lenses commonly employed.

What I claim is As a new article of manufacture, a lighthousing closure composed of film-like flexiole material having a succession oi? concentrically arranged projecting portions of progressively varying diameters to reinforce the closure, said projecting portions merging by easy curvatures into one another to (0 permit flexing of the closure under lateral pressure Without breakage.

in testimony whereof I hereunto aifiX my signature in the presence of two Witnesses.

'CHARLES H. MUGKENHIRN. Witnesses THOMIAS M. GRIFFITI-I' JOHN DOW. 

